Not sure of the origins of this light, acquired in the purchase of a gun show retailer. Here’s what the manual states: 500 LumenMil-Spec Type III hard anodized finishAluminum alloyIPX8 WaterproofPrecision aluminum reflector5 function: High, Medium, Low, SOS, StrobeTail StandingAnti reverse protection (battery)CREE XML T6Requires 2×18650 batteries (not included)